I can't find specific stats from ViewSonic on an VE180, but it seems the settings would be something like:
Horiz :30-82kHz
Vert :50-75Hz
If XConfigurator isn't floating your boat, you may want to try and change the config file by hand. An XF86Config file is pretty daunting, but approachable. I can't remember if RedHat 7.1 shipped with a version of XFree 4.0+, but it should have if I have my dates right. The earlier Xs, v3.3.? and below didn't handle flat screens very well. Plus, you have one of the newer model monitors on the planet, so you may want to update the entirety of XFree86. I'm pretty sure they have v4.2.0 in RPM format by now.
There are no real drivers specifically built for monitors... yet. Its more a matter of whether the windowing system is mature enough to send them a signal they can understand. Technically, a well hacked up XF86Config file from RedHat 5.2 could probably make your monitor look fine.
Oh, the location of the XF86Config-4 (which should be the one to edit) is in /etc/X11.
Good luck,
Finegan
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